BUG: Add fillna at the beginning of _where not to fill NA. #60729 #24442

Job	Run time
python-dev	0s
Pyodide build	23m 1s
Linux-32-bit	18m 24s
Linux-Musl	15m 23s
macos-13 actions-313.yaml	48m 53s
windows-latest actions-313.yaml	46m 36s
macos-13 actions-310.yaml	40m 34s
macos-13 actions-311.yaml	27m 36s
macos-14 actions-310.yaml	17m 54s
macos-14 actions-313.yaml	27m 11s
macos-14 actions-312.yaml	27m 46s
windows-latest actions-312.yaml	38m 57s
macos-14 actions-311.yaml	17m 51s
windows-latest actions-311.yaml	40m 59s
windows-latest actions-310.yaml	37m 53s
macos-13 actions-312.yaml	40m 54s
Numpy Dev	17m 16s
ubuntu-24.04 actions-311.yaml	41m 56s
ubuntu-24.04 actions-313.yaml	49m 0s
ubuntu-24.04-arm actions-310.yaml	36m 32s
ubuntu-24.04-arm actions-311.yaml	37m 55s
Downstream Compat	6m 6s
Pyarrow Nightly	21m 27s
Locale: zh_CN	24m 0s
ubuntu-24.04-arm actions-312.yaml	35m 3s
Minimum Versions	23m 7s
ubuntu-24.04-arm actions-313.yaml	35m 19s
Freethreading	21m 6s
Locale: it_IT	23m 47s
Future infer strings	45m 57s
ubuntu-24.04 actions-312.yaml	43m 55s
Future infer strings (without pyarrow)	39m 40s
ubuntu-24.04 actions-310.yaml	49m 7s
	17h 1m 5s

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